What is CVE-2026-38753?

CVE-2026-38753 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. A use-after-free in the awk_sub() function (editors/awk.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted AWK script.

Which CVE IDs does CVE-2026-38753 cover?

CVE-2026-38753 covers the following CVE IDs: CVE-2026-38753. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-38753?

CVE-2026-38753 has a CVSS v3 base score of 4.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-38753?

CVE-2026-38753 affects 2 products, including: azl3 busybox 1.36.1-24 on Azure Linux 3.0; azl3 busybox 1.36.1-26 on Azure Linux 3.0.

CVE-2026-38753MediumCVSS 4.9

A use-after-free in the awk_sub() function (editors/awk.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted AWK script.

Vendor

Microsoft Security Response Center (MSRC)

Published

July 23, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-38753 →

🎯 Affected products2

azl3 busybox 1.36.1-24 on Azure Linux 3.0
azl3 busybox 1.36.1-26 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.36.1-25 KBCBL-Mariner Releases (Security Update) — fixed build 1.36.1-26

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-38753
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade